Final GPUSync implementation.wip-gpu-rtss12

1 files changed, 34 insertions, 0 deletions

diff --git a/kernel/softirq.c b/kernel/softirq.c
index 1c42e08fdfaa..5ce271675662 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -412,12 +412,44 @@ struct tasklet_head
 static DEFINE_PER_CPU(struct tasklet_head, tasklet_vec);
 static DEFINE_PER_CPU(struct tasklet_head, tasklet_hi_vec);
 
+#ifdef CONFIG_LITMUS_NVIDIA
+static int __do_nv_now(struct tasklet_struct* tasklet)
+{
+        int success = 1;
+
+        if(tasklet_trylock(tasklet)) {
+                if (!atomic_read(&tasklet->count)) {
+                        if (!test_and_clear_bit(TASKLET_STATE_SCHED, &tasklet->state)) {    
+                                BUG();
+                        }
+                        tasklet->func(tasklet->data);
+                        tasklet_unlock(tasklet);
+                }
+                else {
+                        success = 0;
+                }
+
+                tasklet_unlock(tasklet);
+        }
+        else {
+                success = 0;
+        }
+
+        return success;
+}
+#endif
+
 
 void __tasklet_schedule(struct tasklet_struct *t)
 {
 #ifdef CONFIG_LITMUS_NVIDIA
         if(is_nvidia_func(t->func))
         {
+#if 0
+                // do nvidia tasklets right away and return
+                if(__do_nv_now(t))
+                        return;
+#else
                 u32 nvidia_device = get_tasklet_nv_device_num(t);       
                 //              TRACE("%s: Handling NVIDIA tasklet for device\t%u\tat\t%llu\n",
                 //                        __FUNCTION__, nvidia_device,litmus_clock());
@@ -461,7 +493,9 @@ void __tasklet_schedule(struct tasklet_struct *t)
                         }
                 }
                 unlock_nv_registry(nvidia_device, &flags);
+#endif
         }
+
 #endif
 
         ___tasklet_schedule(t);